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Does Sulfamethoxazole And Trimethoprim Interact with Drugs Known To Induce Hyperkalemia?

Sulfamethoxazole And Trimethoprim and Drugs Known To Induce Hyperkalemia have a major drug interaction according to U.S. FDA drug labeling data. Concomitant use with trimethoprim and drugs that induce hyperkalemia may cause hyperkalemia, particularly in patients with renal insufficiency or underlying potassium metabolism disorders. The mechanism involves trimethoprim induces progressive increase in serum potassium concentrations; additive effect with other hyperkalemia-inducing agents. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.

Severity
Major
Sulfamethoxazole And Trimethoprim Class
Sulfonamide Antimicrobial
Management
Close medical supervision required
Data Source
U.S. FDA via OpenFDA

How This Interaction Works

The interaction between Sulfamethoxazole And Trimethoprim and Drugs Known To Induce Hyperkalemia occurs because trimethoprim induces progressive increase in serum potassium concentrations; additive effect with other hyperkalemia-inducing agents. Clinically, this means concomitant use with trimethoprim and drugs that induce hyperkalemia may cause hyperkalemia, particularly in patients with renal insufficiency or underlying potassium metabolism disorders. This is classified as a major interaction, meaning it could cause serious harm if not properly managed. Your healthcare provider may need to adjust dosages, substitute one medication, or increase monitoring frequency.

What To Tell Your Doctor or Pharmacist

If you are taking Sulfamethoxazole And Trimethoprim and your doctor is considering prescribing Drugs Known To Induce Hyperkalemia (or vice versa), make sure to:

  • Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
  • Ask whether the benefits of combining these medications outweigh the risks for your specific situation
  • Ask what symptoms to watch for that would indicate the interaction is causing problems
  • Ask how frequently you should be monitored while these are co-prescribed
  • Ask whether any dosage adjustments are needed
  • Never stop or change either medication without first consulting your healthcare provider
💊 Sulfamethoxazole And Trimethoprim(Sulfamethoxazole And Trimethoprim)+💊 Drugs Known To Induce Hyperkalemia

Severity & Interaction Details

⚠️
major
Use with caution — major interaction
Serious risk of clinically significant harm. Generally avoid; if used, monitor closely.
Severity scale
MinorContra
On record
Yes
Drug A class
Sulfonamide Antimicrobial
Drug B class
—
Source
NLP:sulfamethoxazole and trimethoprim

What this means in plain English

Concomitant use with trimethoprim and drugs that induce hyperkalemia may cause hyperkalemia, particularly in patients with renal insufficiency or underlying potassium metabolism disorders.

What the FDA label says

"Trimethoprim induces progressive increase in serum potassium concentrations; additive effect with other hyperkalemia-inducing agents"

📖 Source: NLP:sulfamethoxazole and trimethoprim

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Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine. For informational purposes only. Always consult your pharmacist or physician.